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sir,actually the ans is given 8.how did you count the number please tell..bt in dihybrid test cross the ratio must be 1:1:1:1....so i dont understand your ans properly.

Asked by Priyanka 6th November 2017, 3:02 PM
Answered by Expert
Answer:
Yes your answer is correct. Actually for the self cross or F2 generation, the ratio comes to be 9:3:3:1(phenotypic ratio) and 1:2:1:2:4:2:1:2:1 (genotypic ratio) but for test cross, the phenotypic ratio is 1:1:1:1. Each individual has 2n=4, or two pair of homologous chromosomes. So, Parent A (4) and Parent B (4). For example, the expected phenotypic ratio of the progeny of a SsYy x ssyy test cross is 1:1:1:1 because SsYy, ssYy, Ssyy, ssyy are predicted to occur in a ratio of 1:1:1:1
 
 
Answered by Expert 7th November 2017, 8:39 AM
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